Heating device for the suction air of combustion engines



June 3, 1930. w RiEHM 1,761,844

HEATIIIG DEVICE FOR THE SUCTION AIR OF COMBUSTION ENGINES Filed April11, 1925 Z ifiuentur' Mm M 27- W aw) yaw the copending application ofair for the Patented June 3, 1930 MANY, A CORPORATION or GERMANYAKTIENGESELPSCH AFT, OF AUGSIBURG GER- HEA'JING DEVICE THE SUCTION AIROF COMBUSTION ENGINES- Application filed April 11, 1925, Serial No.

' In order to start self-igniting combustion engines of the Diesel orconstant-pressurecycle type it is proposed to heat the suction I purposeof quickly and, safely starting the engine. Reference is directed toWilhelm Riehm, Serial N 0. 22,327 filed April 11, 1925, wherein thisfeature is disclosed. A'ccording to this invention a device is providedserving for this purpose, said device consisting of a metal blockwith aset of longitudinal and a set of tranverse passages which are adjacentto each other and which may be arranged above aheating flame in such amanner that the heating gases will pass through one set of passagesthereby heating said block, while the sucked in air is passing throu hthe set of passages perpendicularly to the flormer, therey being heatedwithout coming in contact with the combustion gases. Instead of themetal block there may also be used a properly constructed body withtubes, through which the heating gases discharge, while the sucked inair will surround the same on the outside. a

It is further essential for the invention, that this heating body isloosely mounted within a casing in such a way that it may be easilytaken out and again inserted. This is of importance for such cases wherethe combustion machine is installed in rooms, in which for the purposesof safety it is notpermissible to employ an open flame. By reason of theheating body being easily exchangeable the latter may be taken out ofthe casing and previously heated outside of the engine-room, forinstance in a special heating stove or in a steam or hot water bath andagain be inserted into the casing for starting the engine.

In the drawing in which like characters of reference designate likeparts throughout the several views thereof:

Fig. 1 is a side elevation with certain parts in section of an internalcombustion engine constructed in accordance with this invention;

Fig. 2 is a in Fig. 1;

Fig. 3 is a horizontal sectional view through plan view of the engineshown 22,331, and in Germany February 14, 1925.

sertion into the casing. I The metal block is v in vertical direction bya set of 1 traversed passa es d and in horizontal direction by a set 0passages e in such passages will not intersect each other. Below themetal block I) a tray f is inserted into the casing Z so that it may beeasily with drawn therefrom, said tray being filled referably with thefuel used by the engine. his fuel is ignited before starting, theengine.

The combustion gases will discharge through the vertical passages d andwill thereby heat the metal block 0. The sucked in air passes 1 throughthe horizontal passages e thereby taking up't-he heat imparted to themetal block by the heating gases, without thereby coming in contact withthe combustion gases. In this manner the sucked in combustion air is pre-heated to such an extent, that only a relatively low pressure will benecessary for the compression, in order to bring about the self-ignitionof fuel injected therein. The starting may therefore also be easily andsafely accomplished when the engine is cold.

Instead of the metal block or body with the passagesdand. 'e a built-upmetal body consisting of tubes may be inserted into thecasing, said bodyhaving for instance a form as represented in Figs. 3 or 4. Thecombustion gases issuing from the heating flame will discharge throughthe interior of the tubes In or Z, while the sucked in air will flowaround the tubes on their outside and thereby be heated.

If the combustion engine be installed in a room, in which for thepurposes of safety it is desirable not to use or, impossible to use anopen flame for the heating of the body 0,

the latter is simply withdrawn in upward a manner that the directionfrom the casing by means of the handles g, heated uptoutside of theengine room in any suitable manner and thereupon again inserted into thecasing. The heating device will in this manner be able to serve for thesame purpose as above described. An

essential feature, of the heating device according to this invention istherefore its ability of being easily exchanged. On the rear side of thecasing b behind the heating body a there is further provided anextension h forming a by-pass for the suction air, which during startingof the engine is closed by the slide As soon as the engine has come toits normal operation, this slide may be removed, so that the greatestpart of the combustion air will enter'into the engine through theby-pass. By this arrangement the resistance against thesucking in of theair, which is caused by the narrow passages of the heating body, isproperlydecreased.

I claim:

1. In a high-compression self-igniting internal combustion engine of theconstantpressure-cycle-type adapted to'operate upon fuel injection, acylinder, a combustion air inlet for said cylinder, means associatedwith said inlet for heating the combustion air ad mitted to said engineon starting, to provide a suliiciently high compression temperaturewithin said cylinder upon starting of the engine to secure self-ignitionof fuel injected therein and means for by-passing unheated combustionair to the engine.

2. In a high-compression internal combustion engine of the constant-pressure-cycle type ada ted to operate with fuel injection andself-ignition, a combustion air inlet, a

' heating device for said combustion air inlet including a metal body,said body having one set of passages for a heating medium, and a secondset of passages separated from the first-mentioned set and disposed inheat-conducting relation thereto for the combustion air, and an externalsource of heat associated with said metal body and adapted to supply aheating medium to said first named set of passages.

3. In a high-compression internal combustion engine of theconstant-pressure-cycle type operating with fuel injection andselfignition, a casing mounted on said engine, said casing providing aninlet for the combustion air fed. to said engine, ametal body carried bysaid casing, said body having two sets of adjacent passages disposed inheat-conducting relation and adapted to receive a heating medium and thecombustion air respectively, a by-pass for combustion air around saidmetal body, and a valve controlling said by-pass, whereby all or aportion of said combustion air may e fed to the engine through the metalbody in accordance with the positioning of said valve.

4. In a high-compression internal combustion engine of theconstant-pressure-cycle type adapted to operate with fuel inject on andself-ignition, a cylinder, a combustion air inlet for said cylinder, acasing mounted on said cylinder, sald casmg provid ng; an air passagecommunicating with said combustion air inlet, and a portable air heaterremovably carried by said casing for heating said combustion air onstarting to provide a sufficiently high compression temperature withinsaid cylinder upon starting of the engine to secure self-ignition offuel injected therein;

5. In an internal combustion engine of the Diesel type operating withfuel injection and self-ignition, a cylinder, a combustion air intakefor said ,cylinder drawingin air from atmosphere, a heater having anexternal source of heat independent of engine operation for heating saidcombustion air during nature.

DR. WILHELM RIEHM.

